Appearance of Silvertop Stringybark Timber
The heartwood of silvertop stringybark is pale brown with occasional pinkish tones, while the sapwood, up to 50 millimetres wide, is visually indistinct from the heartwood. The timber features a close, straight grain with a medium and even texture, typically free from gum veins, adding to its clean and uniform appearance.
Applications of Silvertop Stringybark Timber
Silvertop stringybark is versatile and used for a range of purposes. It is commonly employed in preservative-treated posts, poles, and sleepers, as well as in building framework, decking, and flooring. Its ability to glue well with phenolics makes it suitable for structural plywood and glue-laminated members. Additionally, the timber readily accepts paint, stains, and polish, enhancing its usability in both structural and decorative projects.
Workability of Silvertop Stringybark Timber
Rated as a moderately hard timber, silvertop stringybark is easier to work than some other hardwoods. It machines well and is amenable to the use of standard fittings and fastenings. Its gluing properties make it a strong candidate for engineered timber applications, including laminated beams and plywood. Its general behavior and properties are comparable to blackbutt.
Durability of Silvertop Stringybark Timber
Silvertop stringybark is classified as a class 3 hardwood, with an above-ground life expectancy of 7 to 15 years and an in-ground life expectancy of 5 to 15 years. Although it is not termite-resistant, its sapwood is immune to lyctid borer (powder post beetle) attack and can be readily impregnated with commercially available preservatives to enhance durability.
Origin and Availability of Silvertop Stringybark Timber
Silvertop stringybark is native to northern New South Wales, where it is relatively common. Timber products derived from this species are widely available in its region of origin, though they may be less common in other parts of Australia.
Source of Silvertop Stringybark Timber
The timber is harvested from native forests, providing a sustainable and versatile material for both structural and decorative applications. Its ease of workability and clean appearance make it a favored choice for a variety of building and design needs.
Very Low | Low | Medium | High | Very High | |
---|---|---|---|---|---|
![]() | |||||
Tangential : | 10.0% | ||||
Radial : | 6.0% | ||||
Unit Movement Tangential: | |||||
Unit Movement Radial: |
Very High | High | Reasonably High | Medium High | Medium | Reasonably Low | Low | Very Low | |
Unseasoned: | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 |
---|---|---|---|---|---|---|---|---|
![]() | ||||||||
Seasoned: | SD1 | SD2 | SD3 | SD4 | SD5 | SD6 | SD7 | SD8 |
![]() |
Structural No. 1 | Structural No. 2 | Structural No. 3 | Structural No. 4 | Structural No. 5 | |
Unseasoned: | F27 | F17 | F14 | F11 | F8 |
Seasoned: | F34 | F27 | F22 | F17 | F14 |
Seasoned: | 850kg/m3 |
---|---|
Unseasoned: | 1050kg/m3 |
Very High | High | Reasonably High | Medium | Low | Very Low | |
Unseasoned: | J1 | J2 | J3 | J4 | J5 | J6 |
---|---|---|---|---|---|---|
![]() | ||||||
Seasoned: | JD1 | JD2 | JD3 | JD4 | JD5 | JD6 |
![]() |
White, yellow, pale straw to light brown | Pink to pink brown | Light to dark red | Brown, chocolate, mottled or streaky | |
![]() |
Modulus of Rupture - Unseasoned: | 87 MPa |
---|---|
Modulus of Rupture - Seasoned: | 143 MPa |
Modulus of Elasticity - Unseasoned: | 15 GPa |
Modulus of Elasticity - Seasoned: | 18 GPa |
Maximum Crushing Strength - Unseasoned: | 38 MPa |
Maximum Crushing Strength - Seasoned: | 73 MPa |
Impact - Unseasoned: | 17 J |
Impact - Seasoned: | 18 J |
Toughness - Unseasoned: | |
Toughness - Seasoned: | |
Hardness - Unseasoned: | 5.5 |
Hardness - Seasoned: | 8.8 |
Low | Moderate | Reasonably High | High | |
(0 - 5 yrs) | (5 - 15 yrs) | (15 - 25 yrs) | (more than 25 yrs) | |
In-Ground: | ![]() | |||
(0 - 7 yrs) | (7 - 15 yrs) | (15 - 40 yrs) | (More than 40 yrs) | |
Above ground: | ![]() | |||
(0 - 20 yrs, usually < 5) | (21 - 40 yrs) | (41 - 64 yrs) | (More than 60 yrs) | |
Marine Borer Resistance: | ![]() |
Lyctid Borer Susceptibility: | Not Susceptible |
---|---|
Lyctid Borer Susceptibility - Other: | |
Termite Resistance: | Not Resistant |
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
EFH Spread-of-Flame Index: | |||||||||||
EFH Smoke-Developed Index: |
1 - non-combustible | 2 - reasonably non-combustible | 3 - slightly combustible | 4 - combustible | |
Fire Properties Group |
Group Number - Other: | 3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-0.85mm |
---|---|
Average Specific Extinction Area: | <250 |
Bushfire Resistance: | BAL 12.5 and 19 – All AS3959 required applications |